Water-tube boiler.



No. 802,121. PATENTED OCT. 17, 1905.

I O. H. SMITH.

WATER TUBE BOILER.

' APPLICATION FILED JULY 3, 1905.

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WATER-TU BE BOILER.

Specification of Letters Patent.

Patented Oct. 17, 1905.

I Application filed July 3, 1905. Serial No. 268,039.

To aZZ whom, it may concern;

Be it known that LCLARENOE HILL SM1TH,of Falmouth, in the county ofBarnstable and State of Massachusetts. have invented certain new anduseful Improvements in Water-Tube Boilers; and I hereby declare that thefollowing is a full, clear, and exact description of the same, referencebeing had to the accompanying drawing, forming part of thisspecification.

This invention relates to improvements in high-pressure water-tubeboilers.

One object of the invention is to so construct a water-tube boiler thattwo paths may be-afforded for the circulation of water.

Another object of the invention is to pro vide a large supply of waterto the series of tubes adapted to receive the most direct heat of thefurnace.

Another object of the invention is to so construct a water-tube boilerthat the cleaning of the tubes is facilitated.

Another object of the invention is to reduce the cost of manufacture ofboilers of this nature.

The invention consists in such peculiar features of construction andcombination of parts whereby the stated objects of the invention andsuch other objects as may be apparent from the following description arecarried into effect, as will hereinafter be more fully described, andpointed out in the claim.

The drawing represents a sectional view of a water-tube boiler,illustrating the new invention.

As shown in the drawing, the boiler has the usual front wall 5 and thebridge-wall 6, between which is located the grate 7. From the upper partof the bridge-wall 6 extends the baffle-plate 8, having theforwardly-inclined member 9, adapted to direct the products ofcombustion forward. The rear wall 10 is furnished with the outlet 11,preferably provided with a damper 12 of any usual construction, theboiler being covered in by the usual top 13, of any well-knownheat-resisting material.

The cross-drums 14 and 15 at the upper part of the boiler are connectedby the series of tubes 16 16 and 17 17, the ends of which tubes aresecured in said drums in any suitable manner. From the drum 15 depends aseries of tubes, as 18, which connect at their lower ends with thecross-header 19, connected in turn by a series of short tubes, as 20,with the lower cross-drum 21. The cross-header 19 is furnished with thecaps 22 22 for closing clean-out openings usual in said headers, andthis header is connected by the inclined series of tubes 23 23 with thefront upper drum 14. From the lower drum 21 extends the inclined seriesof tubes 24 24, which extend directly above the iire-box or furnace, thefront ends of these tubes 24 being secured in the crossheader 25, havingthe caps 26 26 and connected with the drum 14 by tubes, as 27. The drum14 may be supplied with a water-gage 28 of any well-known construction.Extending across the tubes 23 24 in avertical direction is thedeflector-plate 29, from which the inclined baflie 30 extends to thedrum 15.

The products of combustion from the firebox first act directly on theseries of tubes 24 forward of the baffle-plate 8 and then rise throughthe corresponding portions of the tubes 23 to the inclined deflectingmember 9 of said baflie 8 and are then deflected by said member towardthe drum 14. Then passing upward these furnace-gases circulate aroundthe tubes 16 and 17 and seek an outlet at the rear of the boiler-casing,being intercepted in such passage by the baffle 30 and deflector 29.Said furnace-gases circulate downward below the lower edge of thedeflector 29 and then upward to the outlet 12, acting on the tubes 23and 24 in such circulation to raise the temperature of said tubes and ofthe water therein. As the tubes 24 are subjected to the most directaction of the heat from the firebox, it is desirable that these tubes besupplied with a large quantity of water, this being provided from thelarge drum .21 and raised in temperature as it passes through thesetubes 24 before it reaches those portions of such tubes extending abovethe firebox. WVhen the temperature of the water in the tubes 24 israised sufliciently, the circulation of the water is through such tubesto the header 25 and drum 14 and thence through the tubes 23 to the drum21. As the temperature of the water is raised to a higher degree thewater will circulate through both series of tubes 23 and 24, through theheader 25 and drum 14, and thence by the tubes 17 to the drum 15. Thewater may also circulate through the tubes 16, the circulation beingunrestricted and rapid, one half the circulation being dischargeddirectly into the drums 14 and 21, while the other half, more or less,is discharged into said respective drums through the headers 25 and 19and tubes 27 20, whereby congestion of steam and water in the headers isprevented.

The reduction in the number of headers is desirable from the point ofeconomy as well as that of facilitating the cleaning of the tubes. Allthe tubes may be cleaned from both ends at once, the drums 14:, 15, and21 being sufliciently large to admit an operative, while the ends of thetubes 23 and 24, secured in the headers, may be cleaned by removing thecaps 22'and 26, as is usual in such constructions.

It is not my intention to limit myself to the specific constructionherein shown and described, as I am aware that modifications may be madein the structure without departing from the spirit of my invention.

. Havingthus described my invention, I claim as new and desire to secureby Letters Patent A water-tube boiler comprising upper front and reardrums, tubes connecting the same, a rear lower drum, a header connectedtherewith, a connection between said header and the upper rear drum, aseries of tubes connected in the front drum and in said header, a secondheader located below the front drum and connected therewith, and aseries of tubes connected in said header and in said lower drum, as andfor the purpose described. I

In testimony whereof I afliX my signature in presence of two witnesses.

CLARENCE HILL SMITH.

Witnesses:

H. J. MILLER, STELLA GoosTRAY.

